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PRODUCT DESCRIPTION
Haynes 718 alloy (UNS N07718) is an age-hardenable nickel-iron-chromium-niobium (columbium)-molybdenum-titanium-aluminum alloy developed to combine excellent strength with good fabrication characteristics in the annealed condition. While limited to applications below 1200°F (650°C), it is significantly stronger at these lower temperatures than materials such as Waspaloy alloy, R-41 alloy, or X-750 alloy.
Haynes 718 alloy is also much easier to weld than these alloys, and is less susceptible to the strain age cracking problems common for gamma prime strengthened materials. At temperatures greater than 1200°F (650°C), 718 alloy is being replaced by Haynes 282 alloy due to the superior strength of 282 alloy at those temperatures as well as its excellent fabricability.
Haynes 718 alloy is normally only used for component applications up to 1200°F (650°C); however, its oxidation resistance is comaparable to that for other gamma-prime-strengthened superalloys.
Haynes 718 alloy Applications
Haynes 718 is used in the following application areas:
- Cryogenic storage tanks
- Gas turbine hot section components
- Fasteners and instrumentation parts
- Various components for oil/gas well down holes and well heads
- Aircraft and land-based turbine engine components such as rings, casings, and formed sheet metal components.
Haynes 718 Alloy Chemical Composition
Haynes 718 Alloy Physical Properties
Haynes 718 Mechanical Properties
Haynes 718 Alloy Thermal Properties
Haynes 718 Alloy Other Designations
Equivalent materials to HAYNES 718 are tabulated below:
Haynes 718 Alloy Fabrication and Heat Treatment
Haynes 718 Alloy Machinability
Haynes 718 can be machined using the common processes used for iron based alloys. The material work hardens during machining and has higher strength and gumminess. It is recommended that heavy duty machining equipment and tooling be used to reduce chatter. Commonly available commercial coolants can be used for the process.
Haynes 718 Alloy Forming
Haynes 718 can be readily formed using all the traditional methods. As this alloy has high strength, powerful equipment has to be used. It is important that the material is properly cleaned of all traces of lubricant after forming to prevent embrittlement from occurring.
Haynes 718 Alloy Forging
Forging can be done at 1121-926°C (2050-1700°F).
Haynes 718 Alloy Welding
Welding of Haynes 718 can be performed using all the traditional welding methods. It is recommended that a matching alloy filler metal be used. Preheating is not required. The surfaces to be welded have to be free from oil, paint or crayon markings.
Haynes 718 Alloy Annealing
Annealing of the material can be performed at 1037°C (1900°F) and then rapidly air cooled.
Haynes 718 Alloy Hot Working
Hot working can be performed by heating the alloy to 1121-899°C (2050-1650°F). The alloy has to be reheated if hot working temperatures drop below 899°C (1650°F).
Haynes 718 Alloy Cold Working
Haynes 718 can be cold worked using all the traditional methods and tooling.
Haynes 718 Alloy Aging
For aging Haynes 718, anneal at 982°C (1800°F) and age at 718°C (1325°F) for 8 h. This should be followed by furnace cooling to 621°C (1150°F) and holding at that temperature for 10 h, and then air cooled.
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